Warning signal

That's the way it works for birds. Familiar to you? It works exactly the same way for us humans!Yellow-striped insects - beware! The bright colours of many insectsoften function as warning signals.

Hoverflies

What about the hoverfly to the right of the yellow jacket? Yellow stripes, yes. Dangerous? Stinger? Not at all! Hoverflies are completely harmless. But that does not prevent us from being a little bit scared of them; and birds avoid them, as well.